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Civil Engineering: |
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Ground Engineering: |
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Drilling Services |
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Drilling Services
Our fleet of 30 drilling rigs allows a wide range of drilling services to be offered and many different drilling methods and techniques to be employed. All of our rigs are track mounted giving a stable drilling platform which is essential to undertake accurate geotechnical drilling work. In addition the majority of our rigs offer multi-angling mast positioning which gives additional flexibility in hole positioning with potential reduction in disruption for work in residential, sensitive and protected locations.
All our rigs are now fully guarded as required by the HSE.
Rig types include:
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- Multi-functional Casagrande C6S and M9 ‘Dual Head’ rotary drilling rigs which allow holes to be simultaneously cased with drilling to depths of up to 350m. The dual head facility enables one-pass, steel cased borehole drilling for a range of functions such as; anchors, drilling through unstable ground, filled mineshafts or landfills, installation of monitoring or measurement equipment, injection of gravel, sand or other infilling materials, accurate angle hole drilling and use with specialist grouting techniques. Integral sophisticated cuttings collection systems enable clean drilling to be undertaken in any location. The ability to ‘drill—in’ casing also enables ‘sealing off’ drill holes into rock head or through water bearing strata.
- Klemm KR904 Geotechnical Drill Rigs. These versatile rotary/rotary percussive rigs weigh 8.1 tonnes and are track mounted with sound proofed diesel engine. They occupy a small footprint enabling operation in limited working space. The mast kinematics are also extremely versatile to meet all drilling positions.
- Klemm KR701 mini rigs. These rigs have a weight of approximately 2.5 tonnes and have a separate towable diesel/hydraulic power pack. They come with powerful single or dual rotary or rotary percussive drilling heads and have extendable masts up to 3m working height. The tracks are retractable and the rig can pass through a 700mm opening. The rig also includes sophisticated kinematics which allows a multi-angling drilling facility.
- Excavator mounted Krupp 25G rotary percussive rigs used in rapid production drilling for probing, shallow mine workings treatment and soil nailing. The powerful Krupp hammer/feed beam units are mounted on JCB 814 carrier units which allows rapid set up and mobility as well as providing a stable drilling platform.
The range of drilling methods and techniques that we are able to operate with these rigs is extensive and includes:
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- Rotary percussive ‘top hammer’ with different bit formations and use of rotary percussive casing to 152mm dia
- Rotary open hole using rock rollers, drag bits & PCD’s to 375mm dia
- Down hole hammers, including high pressure water hammer, to 375mmdia
- Overburden drilling systems to 300mmdia
- Dual head simultaneous casing drilling to 300mm dia.
- Rotary coring to 150mm dia (‘SW’, ‘PW’ and ‘412’))
- Auger drilling to 300mm dia
- Installation of temporary or permanent casing
- Drilling in artesian water or coal bed gas conditions requiring use of wellhead control systems
- Flushing methods to suit drilling parameters, for example; air flush, high pressure air flush, water flush, air/water mist, drilling muds, polymers or grout
- Drilling in restricted working spaces or where light loading is required with mini-rigs
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Using our range of drilling equipment and the methods and techniques described above allows us to construct boreholes for any of the following uses. We can also modify or tailor drilling equipment and accessories to suit specific site or client requirements. |
- Boreholes to 1500m deep and 375mm diameter
- Fully cased holes to 350m
- Site Investigations (probing, open hole, coring, installation of monitoring equipment and geophysics)
- Grout injection holes including; tremmie, packer grouting and ‘end of casing’ methods
- Mine Infill holes including observation, monitoring holes and granular infill
- Installation of permanent and temporary caasing
- Groundwater and gas monitoring holes
- Cavity surveys using CCTV, ultrasonic and laser equipment
- Gas venting and leachate control boreholes
- Water abstraction boreholes including pump installation, well screen, risers, valves and level control equipment
- Deep wells for dewatering installations
- Groundwater and gas barrier construction
- Coal bed methane extraction boreholes
- Geothermal heating systems
- Anchoring, soil nailing, mini-piling and rotary cased piles
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The company has designed, developed and manufactured many specialist and innovative items of drilling plant and equipment to suit specific contracts or methods, environmental controls and also to maximise the efficiencies that can be achieved with bespoke plant. Examples include:
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- Use of modified Casagrande B125 CFA rigs for installation of permanent packers at up to 1400m deep followed by staged grouting of deep site investigation boreholes drilled at the proposed Nirex Repositary, Sellafield. The lower part of the deep investigation holes below packer level remains open with geophysical monitoring equipment.
- Development of an innovative auger fed placement and distribution system for infilling mines, voids and cavities with stone or granular materials. The system is based on Casagrande C6S or M9 dual head drill rigs and can accommodate an auger placement string of up 375mm dia and 40m in length. The system has been used successfully to fill redundant subways with cement bound stone using a single infill point and also to install a 100m long stone barrier in a flooded limestone mine with considerable saving in drilling costs to the client.
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Development of bespoke cuttings collection systems for use with our dual head drilling rigs which allow collection of wet or dry cuttings to either dust collector or sealed skip enabling clean drilling in any location. The unit which is mounted below the lower drill head can also be used for wellhead control for gas or water.
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Using the benefits of the ‘dual head’ fully cased drilling system to install deep geothermal boreholes—see ‘Geothermal Heating’ capability page.
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